Hi Donna. I was diagnosed with Meniere's about 7 years ago, and I've had Fibro for at least 8 years, probably more. I also had the lovely water in the ear squirt test, had a horrible panic attack, and made them stop. I had a bunch of other tests for Meniere's too, but none of them were nearly as horrible.
I do believe there is a connection. I have several illnesses that "no one knows what causes it," but I think they are all somehow autoimmune related.
I'm in a pretty bad fibro flare right now too, and I've been waking up in the middle of the night (strange) with vertigo. I have gotten to the point with my Meniere's that I am having more balance problems (due to nerve damage) than actual vertigo.
When my vertigo was at its worst (and I say that as if it is in the past, knock on wood), I was taking HCTZ (a diuretic), and Valium and Benadryl every night before bed. A lot of people just use Valium during an attack, but I found it helped to take it prophylactically at night. But, if you want to try Valium and Benadryl together, you should probably ask your doctor first. Technically, they aren't supposed to be taken together.
I did watch salt intake pretty closely at first, but it didn't seem to make much of a difference for me.
Another thing I do is try really hard to avoid visual triggers: striped wall paper, flashing lights, flickering candles, looking up (or down), long rows of bookshelves (weird, I know), etc. This has helped me a lot.
I hope you feel better soon. I know how miserable it can be.
Hugs - Austen
"There is no charm equal to tenderness of heart." - Jane Austen